Where does “многочасовой” come from?

многочасовой (Russian) comes from Russian час, from Old East Slavic часъ, from Proto-Slavic časъ, from Proto-Balto-Slavic keʔs-, from Proto-Indo-European k(ʷ)eh₁s-.

многочасовой (Russian): many-hour, multihour lasting many hours, produced for many hours in a row, calculated for many hours, etc

Definitions

  1. many-hour, multihour lasting many hours, produced for many hours in a row, calculated for many hours, etc

Ancestry of “многочасовой”, step by step

многочасовой traces back through two separate lines of ancestry.

via Russian час

StepLanguageWordMeaning
1Russianчасhour, o'clock, time, time of day; hours, o'clock;...
2Old East Slavicчасъtime; hour; happiness, luck
3Proto-Slavicčasъtime
4Proto-Balto-Slavickeʔs-—
5Proto-Indo-Europeank(ʷ)eh₁s-—

via Russian мно́го

StepLanguageWordMeaning
1Russianмно́гоmany; much; multi-, multiple, many
2Proto-Slavicmъnogъmany
3Proto-Balto-Slavicmanagasmany
4Proto-Indo-Europeanmonogʰos—
5Proto-Indo-Europeanmengʰ-—
Every word from Proto-Indo-European k(ʷ)eh₁s- →Every word from Proto-Balto-Slavic keʔs- →Every word from Proto-Slavic časъ →